Method of and apparatus for producing multishade mottled paper



NOV. 20, 1934. Q HEDSTRONL JR 1,981,803

METHOD OF AND APPARATUS FOR PRODUCING MUL'IISHADE MOTTLED PAPER Filed March 7, 1934 BY wayzawliz ATTORN EYS Patented Nov. 20, 1934 PATENT OFFICE METHOD OF AND APPARATUS FOR PRO- DUCING MULTISHADE MOTTLED PAPER Olof H. Hedstrom, In, Hartford City, Ind.

Application March '7, 1934, Serial No. 714,489

'7 Claims.

The invention relates to a method of and apparatus for producing multi-shade mottled paper.

The main objects of this invention are:

First, to provide an apparatus for the production of colored paper having in effect a multishade mottled or variegated appearance at both sides thereof.

Second, to provide an apparatus wherein the coloring matters in solution are intimately brought together in part or in whole while in suspension or in the air and dropped upon a web on a paper machine, thus producing an effect impossible to obtain otherwise, and such apparatus being easily embodied in a standard type Fourdrinier paper making machine.

Third, to provide a method of producing a mottled or variegated effect to paper having multi-shades throughout such effect and this being accomplished during the process of manufacture of the paper.

Fourth, to provide a method of effecting a mottled or variegated paper product, the mottled or variegated effect being multi-colored with a blend thereof and such colors or shades being variable in kind.

Other objects will be in part obvious and in part hereinafter pointed out and the invention being defined in the claims hereunto appended.

A preferred embodiment of the features of the invention is clearly illustrated in the accompanying drawing and the manner of carrying out the method being also illustrated thereby.

Figure 1 is a side elevation of a paper making machine of the Fourdrinier type and having the features of construction constituting the present invention embodied therewith, as well as showing the manner of carrying out the method of producing mottled or variegated paper of multishade.

Figure 2 is an enlarged fragmentary top plan view partly diagrammatic.

Similar reference characters indicate corresponding parts throughout the several views in the drawing.

Referring to the drawing in detail, the Fourdrinier wire of a paper making machine is designated generally at A, supported in the ordinary manner upon beams therefor as rollers 10, 11 and 12 and the breast and couch rollers 13 and 14, respectively.

Operating with the wire A is the deckle strap 15 traveling over wheels 16 and 17, respectively, and being in contact with the said wire. The 55 pulp for the making of the paper is flowed onto 20 may be any paper filler of high opacity, such (01. 92-40) the wire A in the usual manner from a feed vat,

a portion thereof being indicated at B, and this pulp is then conveyed through the paper making machine conventionally.

Slightly elevated with relation to the path of both the wire A and the deckle strap 15 at the stretches thereof in cooperating relation to each other is a pair of spaced troughs 18, each preferably of the width of the wire A and having the rounded bottom 19. Into these troughs 18 is delivered the coloring matter in solution, it being preferable that the coloring solution be of different shades as may be contained within the receptacles 20, there being for each trough 18 an overflow leveling pipe 21 which has communication with said trough at a selected point above the lowermost portion thereof or its bottom 19. Located adjacent to each trough 18 is a fluid pump 22, the same having the in-lead 23 extended into the receptacle 20 and the out-lead 24 opening into the trough, so that a forced feed of the fluid from the receptacle 20 to the trough 18 can be had in the operation of the pump 22.

Operating each pump 22 is a variable speed controlled electric motor 25, its variable speed control being indicated at 26.

Working within each trough 18 is a rotary brush 27 having the staggered or irregularly arranged prongs 28 and its axle 29 is operated from a variable speed controlled electric motor 30, the variable speed controls therefor being indicated at 31. The prongs 28 of the brush 27 in each trough 18 are adapted to enter the liquid within said trough at varying depths to produce heavy or light splash effect in the mottling or variegating operation of the machine, the level of the liquid in each trough being controlled by the overflow pipe 21.

The liquids as contained within the receptacles as zinc oxide, titanium oxide, their sulphides, or asbestine, suspended in water, either alone or with dye, it being preferable that the shades of the dye be of different hues in the respective'receptacles, although the material constituting the liquid may be of any other substance that will produce the effect desired, such as beaten stock or the like.

It is essential and most important that the troughs 18 be arranged opposite each other at a 1 55 determined distance one from the other and that the feed of the liquids from these troughs be directed upwardly and outwardly toward each other, so that these liquids, as the same are thrown from the troughs, will contact or hit each other and thusdntermingle in suspension or in the air before the same are dropped onto or delivered to the web on the paper making machine, thus producing a multi-shade mottled or variegated efiect to the paper during its manufacture andsuch effect being only obtainable by the intermingling in the air of the liquids or when the same are suspended before delivery to the web.

Another essential and important feature of the invention resides in the use of the variable speed motors 25 and 30, respectively, for the pumps and brushes of the apparatus, in that it has been found in practice that when the brushes are speeded up to the proper speed they throw too muchliquid,causingalowering of the level of such liquid in the troughs below the overflow points. To eliminate this it is necessary to speed up the pumps 22 to a point where the same deliver enough liquid to maintain the proper elevations in the troughs as may be required and it is essential to vary the speed of the pumps and also the brushes in their working to conform to the speed of travel of the web in the paper making machine, with a resultant desired effect of mottling or variegation to the web. It will be apparent that the motors 25 and 30 are individually variable speed controlled.

By a variable speed of each brush 28 in each trough 18 this enables a controlof the centrifugal force with which the drops of colored liquid are thrown out from the trough and as the said drops are thrown from opposite sides of the trough a certain amount of the drops from both troughs will hit and intermingle in the air with each other before they land on the web of pulp on the paper making machine and thus producing an eifect only obtainable thereby, with the result that the mottled or variegated characteristic of the web involves multishades blended with each other.

The troughs 18 in their opposed confronting relation to each other are carried by the supports 32 elevated from the wire A of the Fourdrinier type of paper making machine.

By varying the speed of both the pump 22 and the brush 27 as associated with one trough 18 differently from the pump and brush of the other trough, it is possible to increase or decrease the application 01' the material comparable with the other trough.

What is claimed is:

1. The combination with a paper pulp convey'or, of oppositely arranged troughs superposed with relation to the path of the conveyor, means for independently supplying fluids to the respective troughs, means operating within the troughs for raining the fluids therein toward each other for intermingling of the same in suspension and the subsequent dropping thereof onto paper pulp upon the conveyor.

2. The combination with a paper pulp conveyor, of oppositely arranged troughs superposed with relation to the path 01' the conveyor, means for independently supplying fluids to the respective troughs, means operating within the troughs for raining the fluids therein toward each other for intermingling of the same in suspension and the subsequent dropping thereof'onto paper pulp upon the conveyor, and means for varying the operation of said means in the respective troughs independently of each other.

3. The combination with a paper pulp conveyor, of oppositely arranged troughs superposed with relation to the path of the conveyor, means for independently supplying fluids to the respective troughs, means operating within the troughs for raining the fluids therein toward each other for intermingling, of the same in suspension and the subsequent dropping thereof onto paper pulp upon the conveyor, means for varying the operation of said means in the respective troughs independently of each other, and means for regulating the supply of fluids to the respective troughs independently of each other.

4. The combination with a paper pulp conveyor, of oppositely arranged troughs superposed with relation to the path of the conveyor, means for independently supplying fluids to the respective troughs, means operating within the troughs for raining the fluids therein toward each other for intermingling of the same in suspension and the subsequent dropping thereof onto paper pulp upon the conveyor, means for varying the operation of said means in the respective troughs independently of each other, means for regulating the supply of fluids to the respective'troughs independently of each other, and variable speed power source for each of the said means.

5. The herein described method of producing in variegated shades characterized by running or splashing upward and outpulp being formed on a paper machine wire.

6. The herein described method 01' producing variegated shades characterized by running or splashing upward and outother, difierent colored fluids from adjacent sources of supply and moving under the combined shower a layer 01' wet paper pulp being formed on a paper machine wire, and regulating the percentage of the components in the shower.

7. The herein described method 01' mottled paper in variegated shades characterized by running or splashing upward and outward toward each other, difl'erent colored fluids irom adjacent sources of supply and moving under the combined shower a layer 01' wet paper pulp being formed on a paper machine wire, regulating the percentage of the components in the shower and regulating the speed of discharge of the colored fluids, rain or spray, from their source of Supp y.

@1015 H. HEDSTROM, JR.

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